vb.net - Count the duration of loading a page in asp.net -

vb.net - Count the duration of loading a page in asp.net -

i want inquire how count duration of loading page in asp.net in second?

for illustration have button open new webform, load few seconds before opens, want count number of seconds before webform open.

note: programming language utilize in asp.net vb

thank in advance.

asp.net vb.net webforms pageload